酸化鐵の水素瓦斯還元及び酸化に就て

概要

論文の詳細を見る
This problem has always studied by several authors, but it is not yet determined whether the reaction Fe_2O_3→Fe_3O_4→Fe or the reaction Fe_2O_3→Fe_3O_4→FeO→Fe takes place. In this paper, the changes in wegiht after reduction and oxidation of the ferric oxide and Anshan hematite are measured by the precision spring thermal balance with an electromagnet applied and the relations between the reactions involving the reduction and the oxidation, and the temperature are determined. In addition, the reducing and oxidizing reactions are discussed by the X ray analysis of the samples reduced and oxidized to different degrees. From the experimental results, it may be inferred that the reduction takes place in the two stages Fe_2O_3→Fe_3O_4→Fe : and the ferrous oxide has no relation to the reduction. When the reduction of ferric oxide is carried out at constant temperature, the first stage of reduction is carried out very rapidly ; and then the second stage of reduction proceeds gradually in a straight line. In the case of reduction at the gas velocity of 70cc per minute, the reaction of Fe_2O_3→Fe_3O_4 begins at 250℃ and completely at 300℃. On the further reduction, the sample is partly reduced to metallic iron, which is not seperated, but exist as a solid solution with Fe_3O_4 up to the percentage reduction of 21%. The metallic iron is saturated at abeut 21% and seperated as a free metal. Then the reaction Fe_3O_4→Fe takes place very rapidly, until the sample is reduced completely to the metallic iron at 480℃ In the case of oxidation of the metallic iron reduced from ferric oxide, the reaction is the reverse of the reducing reaction : i. e., Fe→Fe_3O_4→Fe_2O_3. The reaction Fe→Fe_3O_4 proceeds very rapidly at 80∿250℃. Then the oxidation Fe_3O_4→ magnetic Fe_2O_3 commences to take place at about 300℃ and the magnetic hematite is altered to non-magnetic at about 500℃. Then the ferric oxide with rhombohedral structure is obtained at 850℃ When the reduction of ferric oxide and Anshan hematite are carried out at the constant gas velocity of 120cc per minute, the relations between the percentage reduction and the time of reduction at varions temperatures are obtained. At a constant temperature, varying gas velocity, the relation between the percentage reduction and the time of reduction is obtained. In the reduction of the ferric oxide, the relation between the velocity of gas, the velocity of reduction and the reducing temperature is determined.
社団法人日本鉄鋼協会の論文
1936-04-25

酸化鐵の水素瓦斯還元及び酸化に就て

スポンサーリンク

概要

著者

関連論文

スポンサーリンク